Breathing is an autonomous function, necessary for human survival. We breathe 15 to 25 times per minute, 24/7, taking in oxygen and expelling carbon dioxide (CO2) via the lungs, a pair of spongy, air-filled organs on either side of the chest.
So what is REALLY happening, deep down, in the details of the process? How does the oxygen get into the bloodstream and CO2 come out? Let’s take a look at the steps: